DAT702

 Standard Query Language  Ability to access and manipulate databases ◦ Retrieve data ◦ Insert, delete, update records ◦ Create and set permissions  databases, tables, procedures and views ◦ Query databases

 ULI101 ◦ HTML ◦ Create a webpage  INT213 ◦ ASP ◦ Connect to database to make webpage functional  DAT702 ◦ SQL ◦ Manipulate data in database connected to webpage

 Relational Database Management System ◦ SQL, MS Access, Oracle, IBM DB2, SQL Server  Data is stored in database objects called tables  A table is a collection of related data organized into columns (fields) and rows (records)

 Defined by SQL  Many are mandatory, but most are optional SELECT name FROM teams WHERE id = 9  SELECT and FROM are mandatory  WHERE is optional

 Names that are given to database objects such as tables and columns  “teams” is the table name  “name” and “id” are column names SELECT name FROM teams WHERE id = 9

 Literals that represent fixed values  “9” is a numeric constant SELECT name FROM teams WHERE id = 9

 A portion of an SQL statement  The SELECT clause is “SELECT from”  The FROM clause is “FROM teams”  The WHERE clause is “WHERE id = 9”

 How the clause is put together  What keywords, identifiers and constants does it consist of  MOST IMPORTANTLY – are they in the correct order according to SQL

 Used to manage database objects such as tables and columns  CREATE, ALTER and DROP mysql> create table teams (id int(5) not null primary key, name varchar(37) not null, division varchar(2)); Query OK, 0 rows affected (0.05 sec)

mysql> create table teams (id int(5) not null primary key, name varchar(37) not null, division varchar(2)); Query OK, 0 rows affected (0.05 sec) | Field | Type | Null | Key | Default | Extra | | id | int(5) | NO | PRI | NULL | | | name| varchar(37) | NO | | NULL | | | division | varchar(3) | YES | | NULL | | rows in set (0.00 sec)

mysql> ALTER TABLE teams DROP COLUMN division; Query OK, 0 rows affected (0.15 sec) Records: 0 Duplicates: 0 Warnings: 0 Check to make sure the column no longer exists

mysql> DROP TABLE teams; Query OK, 0 rows affected (0.03 sec) Check to make sure the table no longer exists

 Used to manage data within tables and columns  INSERT, UPDATE and DELETE  (RE-CREATE THE TEAMS TABLE)

 mysql> insert into teams values (‘12345', ‘Toronto', ‘NE');  Query OK, 1 row affected (0.02 sec)

 UPDATE teams SET name = ‘TO‘ WHERE name = ‘Toronto';  Query OK, 1 row affected (0.02 sec)

 DELETE FROM teams WHERE name = ‘TO';  Query OK, 1 row affected (0.02 sec)

 load data local infile 'test.txt' into table TEAMS lines terminated by '\r\n';